Cut your screen or filter paper to size and press it over the drainage layer. It doesn't need to be perfect—just prevent soil from falling through.
The concept draws from the science of ecology and the famous Biosphere 2 project in Arizona—but your version will fit neatly on a windowsill. Inside the bottle, plants produce oxygen through photosynthesis, animals (if present) release carbon dioxide, microbes decompose waste, and water continuously evaporates, condenses, and falls back to the soil.
Not all plants survive in high-humidity, low-airflow environments. Avoid succulents and cacti, which rot quickly in closed containers. Instead, choose slow-growing, moisture-loving tropical plants. Plant Name Ideal Placement Vibrant pink, white, or red veins; loves humidity. Foreground / Accent Biophytum sensitivum Looks like a miniature palm tree; adds height. Centerpiece Peperomia (various species) Compact growth habit; sturdy, attractive leaves. Mid-ground Creeping Fig ( Ficus pumila ) Excellent climbing or trailing ground cover. Background / Walls Java Moss / Cushion Moss Retains moisture; creates a lush green "lawn." Foreground / Base Step-by-Step Construction Guide
So find a jar, gather some pebbles, and start building. A whole world awaits inside that bottle, ready to grow and thrive with nothing but your careful attention and the gentle glow of sunlight. Bottle Biosphere Guide
Use a clear glass jar, carboy, or large bottle with a tight-fitting lid.
During the day, plants use light to perform photosynthesis, consuming CO2 and releasing oxygen. At night, they respire, consuming a bit of that oxygen and releasing CO2 back into the system.
Close the lid securely. Place the biosphere in a room with bright, indirect sunlight. Troubleshooting and Long-Term Maintenance Cut your screen or filter paper to size
Add 1-2 inches of pebbles or gravel to the bottom. For tall containers, add more depth to prevent waterlogging.
Window screen mesh, coffee filter, or cheesecloth. Prevents soil from falling into drainage layer.
Before starting, thoroughly wash the inside of the glass container with hot water (avoid soap, which leaves chemical residues) and let it dry completely. Step 1: Install the Drainage Base 4. Step-by-Step Assembly
Before planting, trim any dead or dying leaves. Remove plants from their nursery pots and gently separate roots.
Succulents and cacti. They require dry air and will rot in a sealed biosphere. 4. Step-by-Step Assembly